Optical scanning apparatus and image forming apparatus

1. An optical scanning apparatus comprising an optical beam emission unit that emits an optical beam, a light guiding unit that guides the optical beam, a deflection unit that deflects the optical beam, and a chamber-shaped housing that accommodates the optical beam emission unit, the light guiding unit, and the deflection unit, wherein the housing comprises a base portion for installation of the optical beam emission unit, the light guiding unit, and the deflection unit, and a cover portion that includes a heat emission channel, which has a concave shape when viewing from side and a linear groove shape when viewing from top, and that transmits heat in the housing to a fluid, and the base portion includes two sidewalls and a transverse wall extending between the sidewalls and having two apertures for the transmission of light, and wherein the cover portion has two apertures for the transmission of light passing through the respective apertures of the transverse wall to the exterior of the apparatus.

2. The optical scanning apparatus according to claim 1 , wherein the base portion has openings which respectively open upward and downward, and respective cover portions are disposed with respect to the top and the bottom of the base portion to cover the openings, and the respective cover portions enable provision of the heat emission channel.

3. An image forming apparatus including an optical scanning apparatus that emits optical beams and scans, a photosensitive member on which an electrostatic latent image is formed by illumination with the optical beams, and a developing device that forms a toner image by developing the electrostatic image, and is provided with the optical scanning apparatus according to claim 1 as an optical scanning apparatus.